New improved impossible differential attack on reduced-round AES-128

Abstract

In this paper, we propose a novel impossible differential attack on 7-round AES-128. Firstly, we construct some new 2-round impossible differentials of AES, which allow us to distinguish the wrong keys from the correct key more efficiently. Based on them, we present an impossible differential attack on 7-round AES-128. The data complexity is about chosen plaintexts. Compared to the best known result, the data complexity of our attack is reduced by nearly times. © 2012 Springer Science+Business Media B.V.